Year	kWh
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	2000000
1987	3000000
1988	6000000
1989	6000000
1990	32000000
1991	39000000
1992	88000000
1993	99000000
1994	200000000
1995	530000000
1996	924000000
1997	1039000000
1998	1129000000
1999	2424000000
2000	2975000000
2001	3994000000
2002	5192000000
2003	6876000000
2004	8562000000
2005	11045000000
2006	15374000000
2007	19278000000
2008	23286000000
2009	30557000000
2010	34168000000
2011	42638000000
2012	52338000000
2013	59897000000
2014	68222000000
2015	75569000000